USL LSS-100 - Manual (Page 11)

LSS−100P Installation & Operation Manual
11
shadow moves across the screen, the LED spots and their location within the test pattern will
become visible. The LSS-100P sensor is a linear sensor positioned midway between the LEDs. If
the test pattern is tall, adjust the LSS-100P to align the spots vertically. If the test pattern is
wide, rotate the LSS-100P to align the spots horizontally. Place the center of the area between
the spots in the center of the test pattern area. Lock the Omnimount position and turn off the
LEDs.
8. Turn on a pink noise source on one of the auditorium speakers. The SPL indicated by the LSS-
100P should be close to that measured with an SPL meter. Again, due to system tolerances and
variations in sound level throughout the auditorium, the numbers will not match precisely.
NTP, IR, and Luminance Check
1. Go back to the NTP configuration page (shown in figure 10) and ensure that the LSS-100P has
received an NTP update.
2. If desired, the LSS-100P luminance measurement can be scaled to agree with a reference meter.
The LSS-100P is factory calibrated, but, because it is not in the same location as a reference
meter in the auditorium, it will probably read slightly different from the reference meter due to
screen gain, elevation of the projector above the screen center, etc. Project the test pattern
(ideally from the LST-100) and measure the luminance with the reference meter. While the test
pattern is still present, key the measured luminance value into the appropriate box (cd/m
2 or fL)
in the Luminance Scaling section of the Auditorium Data page (see figure 8). Click the “Save
Settings” button to scale the LSS-100P luminance measurement to match the reference meter.
You can click the “Reset Luminance Scaling” button to return the LSS-100P to factory calibration.
3. IR Calibrate also appears on the Auditorium Data page (board revision F and higher). Press the
“Set IR Reference” button when typical IR illumination of the screen is present. When the LST-
100 test content plays, a USL UPC-28C emitter transmits the hearing impaired and closed
caption carriers, but not the visually impaired carrier. If you click the “Set IR Reference” button
when the LST-100 content is playing, the LSS-100P will set this level to 100%. The LSS-100P will
read about 75% if only one IR carrier is present. It will read about 117% if all 3 carriers are
present.
Figure 13 - LSS-100 LED Focus and aim.